package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> dishByCategoryId(Long categoryId) {
        Dish dish = new Dish().builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.dishByCategoryId(dish);
    }

    @Override
    public void getStatusById(Integer status, Long id) {
        Dish dish = Dish.builder()
                .status(status)
                .id(id)
                .build();
        dishMapper.updateStatusById(dish);
    }

    @Transactional
    @Override
    public void updateDishById(DishDTO dishDTO) {
        // 更新菜品表
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.updateDish(dish);

        dishFlavorMapper.deleteByDishId(dish.getId());

        List<DishFlavor> flavors = dishDTO.getFlavors();

        if (flavors != null && flavors.size()>0) {
            for(DishFlavor dishFlavor:flavors){
                dishFlavor.setDishId(dish.getId());
            }
        }

        dishFlavorMapper.insertBatch(flavors);
    }

    @Override
    public DishVO getDishById(Long id) {
        Dish dish = dishMapper.selectById(id);
        // 根据ID，获取菜品口味列表
        List<DishFlavor> dishFlavorList = dishFlavorMapper.selectByDishId(id);
        // 封装DishVO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO); // 把dish对象的数据复制到dishVO
        dishVO.setFlavors(dishFlavorList);
        return dishVO;
    }

    /**
     * 批量删除菜品
     * @param ids
     */
    @Override
    @Transactional
    public void deleteDishById(List<Long> ids) {
        //判断当前菜品是否能够删除---是否存在起售中的菜品？？
        for (Long id :ids){
            Dish dish = dishMapper.selectDishById(id);
            if (dish.getStatus() == StatusConstant.ENABLE){
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //判断当前菜品是否能够删除---是否被套餐关联了？？
        Long number = dishMapper.selectCountByDishIds(ids);
        if (number != 0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品表中的菜品数据
        for (Long id : ids){
            dishMapper.deleteById(id);
            //删除菜品关联的口味数据
            dishFlavorMapper.deleteByDishId(id);
        }


    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult findDishPage(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = (Page<DishVO>) dishMapper.selectDishPage(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 新增菜品和对应的口味
     *
     * @param dishDTO
     */
    @Override
    @Transactional
    public void addDish(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        dishMapper.insertDish(dish);

        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            dishFlavorMapper.insertBatch(flavors);//后绪步骤实现
        }
    }
}
